Richard A. Crowe,
Believe only half of what you see, the adage says. This age-old wisdom is a warning that our sense of sight is easily deceived. Optical illusions can result from geometrical tricks that play havoc with the preconceived notions of our perception—like Escher's prints. They can also result from the very physiology of the eye itself.
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Publish Date: 01 November 1991
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